Kids books

My daughter is 9 and is a good reader with a variety of tastes. Currently she is into Wayside stories, which I bought her 3 years ago, so I find it funny how that came around like that.

My 4 year old daughter is still in the Dr. Seuss books and various Disney princess books, but my question is more for my son.

He is 1 and a half and likes to get in the way of reading time with my daughters, and all, which works, but I want to get some books for him. I am looking for suggestions for a 1 year old boy as most of our collection consists of books for girls? Any ones that you share with your boy kidlets?